[AF] The SF Overpass

[Craig Bowman]

It has been years since I had anything to do with the master FM combiner 
there but I do not remember that typical gray asbestos insulation 
sprayed on the I beams on (as I remember) 110.

Craig Bowman


Phil Alexander wrote:
> On 1 May 2007 at 9:13, Dana  Puopolo wrote:
>
>   
>> The overpass had NO fire retardent. The towers had some type of rated fire
>> retardent. No, it wasn't asbestos, but that's not the only one out there.
>> http://en.wikipedia.org/wiki/Passive_fire_protection
>>     
>
> If memory serves, the twin towers DID have asbestos concrete sputtered over
> the beams part way up the towers and further application was stopped by
> the environmental outcry WRT asbestos. Beyond that point, I'm not sure
> if the steel was naked or some other less effective coating was used.
>
> The design of the towers WITH asbestos insulation of the steel was to
> withstand a direct hit by a fully loaded 707 of the largest configuration
> (similar to the old AF-1) because that was the biggest plane flying when
> the structures were designed.
>
> Had the insulation been carried out as designed, the structures might 
> have stood, and at the very least far more time to evacuate would have
> been available.
>
> Once again the law of unintended consequences rears its ugly head.
>
> ---------------------------------------------
> Phil Alexander, CSRE, AMD
> Broadcast Engineering Services and Technology 
> (a Div. of Advanced Parts Corporation) 
> Ph. (317) 335-2065   FAX (317) 335-9037
>
>
>
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